Light of wavelength and frequency f passes through a single slit of width a. The

Question

Light of wavelength and frequency f passes through a single slit of width a. The diffraction pattern is observed on a screen a distance x away from the slit. Which of the following will decrease the width of the central maximum?

Decrease the slit width

Decrease the frequency of the light

Decrease the wavelength of the light

Decrease the distance x of the screen from the slit.

More than one of the above actions will cause the width to decrease. (Correct Answer, but which are true and which are not?)

Explanation / Answer

Decrease the wavelength of the light

Decrease the distance x of the screen from the slit.

Explanation:- sin=/a, and y=Ltan

Decreasing a decreasing f, and decreasing all decrease (and thus y).

decreasing L also decreases y.

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